Roof construction



Oct. 3, 1933. T. s. BRADLEY 1,928,751

ROOF CONSTRUCTIOfi Filed June 24, 1929 INVENTOR 7190/7/95 .s. 524045) m5 ATTORNEY Patented Oct. 3, 1933 PATENT OFFICE 1,928,151 noor oonsrauo'non to'l'he cisco, Calif., a corporation of Delaware Application June 24, 1929. Serial No. 378,819

1. Claims.

' My invention relates to roofs, and particularly to metal-railway car roofs.

One of the objects of the invention is the provision of a roof structure, which is characterised 5 by economy and great durability.

Another objectof the invention is the provision of a roof construction which is rust-proof.

Another object of the invention is the provision of a roof of the character described, which is non-skid, thereby affording safety for persons walking on the roof in wet weather.

' Another object is the provision of a roof construction which absorbs vibrations and prevents I noise.

A further object of the invention is the pro-- vision of a roof of .the character described which possesses improved wear-taking properties.

My invention other objects and valuable features, some of which will be set forth in the following description of my invention which isillustratedinthedrawinesformingpartofthe specification. It is to be understood that I do notlimitmyselftothe showingmadebythesaid I description and drawings, a I'm adopt varying forms of my invention within the scope of the claims.

Referringtothedrawing-z.

Figurelisaperspectiveviempartiyinverticalsectiomoftherailwaycar roof of my invention.

Figure 2 is an enlarged. fragmentary, verticahsecti'onalview ofthetopoftheroofdeck and the covering material whichis-united thereto,lookinginthedirectionofarrow2ot1'igure1.

In terms of broad inclusion, my invention comprismarailwaycarroofconstructionwhichis structurally a singie unit, and which comprises an-overlying'layer of a fibrous sheet adhesively imitedtoasub-structureordeck. Theilbrous sheetissaturatedwith asemi-solidmaterialto render the sheet slightly and slowly y ldable' under impact; and the sheet is preferably coated onitssurfacewithawater-proofmaterial solid at normal temperatures.

with reference to the preferred t ofmyinventionindetaiLtherooft illustratedinconnectionwithametalrailway car 2 of any conventional and havtendingiongitudinallythereoi.isa.la'yer4of stripofflbrousmaterlahsuchasafeitsheet manufactured by methods similar to that rooflngfelt. Itispreferredtouseafelt water-proof and in its untreated state weighs from 40 to poundspermsquarefeet ofmaterial. Itisobvious, however, that variations of this weight may be adopted, in accordance with the heaviness of material desired. 00

f This sheet is treated by saturation with a bituminous material, such as the residue from California crude petroleum having a penetration of fmm to 200 at 77 R, 100 grams, 5 seconds, accordingtothemethodsoftheAmerieanSociety for'lcstingllaterials, Standards of 192'Landa softening point of 1". to 1!, according tothesamestandards, and semi-solid atordinary temperatures. The sheet is also preferably provided on the upperorexpomsurface, or on both 70 sides, with a coating 6 of bitmninous material, such as asphalt solid at ordinary tempera-tines, andhavingasofteningpointoffrom1".to 200 F. and a penetration of 12 to 20, according tothestandardsreferredtoinconnectionwith 1 thesaturant. Thecoatingemoreor less with the saturant.

Before the coating hasdried, the sheetisgiven a light dusting of a mineral powder i, such as crushedcreekorbeachsandtheflnenessbeing. suchthatthematerialwillpassthmanwmesh screen. It is apparent, however, that various otheroffinenessmaybeemployed,and thatothersimilarmaterialsuchascrushedrock, brIcLoranyotheriineiydividedmterialnfl beused The fibrous strip is adhesiveiy united to the meteldeck3byaiayer8ofbituminouseement, preferably a relatively hard steam-blownasphalt diseoivedincarbondisimbensoiorothersuitablesolvent. Thiscementimlneraformsa ilrmbondwiththemetfldeckaandimiteswith the'saturantorcoatingofthesheet,sothatthe deckandoveriyinelayer4ofnbrousmaterialprovideaimitarystructure. Thisresultsinastructime having a rigid nonresilientbese faced witln 'awea'btakinglayerilrmunderthehnpactofflie feetofpemonswhomaywalkthereovenandpassensing the peculiar property of W on minor injuries in the surfeeeQwhich may be caused'byhobnailboots.

Heretoi'ore,inordertoprotectmetalrailway carroofsagainstcorrosi n-particularlypessen ltis a'pparent thatafterashorttimetlmpei'nt ischippedoifat'placesbymenwalkingovcrthe roof,which occm's-moeteenerallyontbecental portionoftheroofwhenthecarsarebeingsupn0 pliedwithiceatdivisionpommorwhentheurl are being cleaned at terminals. Corrosion then sets in, and unless the roof is painted over at frequent intervals, the roof soon deteriorates. By the use of the described 'roof structure, the central part ofthe roof, subjected to practically all the wear, is protected by a wear-taking, wa-

- ter-proof and rust-proof. covering, thus materially increasing the life of the roof. The side portions of the roof may be painted, according to usual practice, or, if so desired, the entire deck of the roof may be covered in the manner described.

longitudinally extendingrunways usually pro- I vided on these cars.

Although the described construction is especially applicable in railway cars having metal decks, it is obvious that it may be employed with cars having non-metal decks.

I claim:

1. A' railway car roof comprising a metal substructure, and an overlying wear-taking fibrous sheet treated with bituminous material, and adhesively united to the substructure.

'2. A railway car root comprising a metal substructure, an overlying fibrous sheet treated with bituminous material, and an intervening cementing layer of bituminous material to bind the whole-into a unitary structure.

, 3. A railway car roof comprising a metal substructure, an overlying fibrous sheet, the fibrous sheet being saturated with a semi-solid material, and an intervening cementing layer of bituminous material to bind the hole into a unitary structure.

4. A railway car roof comprising a metal substructure, an overlying fibrous sheet saturated with a semi-solid bituminous material, and coated on its exposed surface with bituminous material solid at normal temperatures, and an intervening cementing layer of bituminous material to bind the whole into a unitary structure.

5. A railway car roof comprising a substructure, and an overlying wear-taking fibrous sheet treated with bituminous material and adhesively united to the substructure.

6. A railway car roof comprising a substructure, an overlying fibrous sheet saturated and coated with bituminous material, and an intervening cementing layer of bituminous material to bind the whole into a unitary structure.

7. A railway on roof comprising a metal substructure, and an overlying. wear-taking fibrous strip extending longitudinally of the car roof, said strip being treated with bituminous material, and adhesively united to the substructure.

8. A railway car roof comprising a substructure, and an overlying wear-taking fibrous strip extending longitudinally of the car roof and saturated with a semi-solid bituminous material, and coated on its exposed surface with bituminous material solid at normal temperatures, and an intervening cementing layer of bituminous material to bind the strip to the substructure.

9. A railway car comprising a roof, a centrally disposed strip of fibrous material extending longitudinally of the roof and .adhesively united therewith, said strip being of a width less than the width of the car and being saturated with semi-solid bituminous material and coated on its exposed surface with semi-solid bituminous material solid at normal temperatures and providing a non-skid waterproof wear-taking runway for protecting the roof.

10. A railway car comprising a roof, .a-centrally disposed strip of fibrous material extending longitudinally of the roof, said strip being of a width less than the width of the car and being saturated with semi-solid bituminous material and coated on its exposed surface with semi-solid bituminous material solid at normal temperatures and providing a non-skid waterproofv wear-taking rimway for protecting the roof, and a layer of bituminous cementing material between the roof and the strip to bond the whole into a unitary structure.

THOMAS S. BRADLEY. 

